Martin Lorton] has a vintage Harmon 4200B selective voltmeter that needed repair. He picked it up on eBay, and he knew it wasn’t working, but it was in good condition, especially for the ...

The 4200B is an RMS voltmeter and is selective because it has a tuned circuit to adjust to a particular frequency. The unit uses discrete components and has an analog meter along with an LCD counter.

Explore the world of RF directional couplers and their role in precise microwave measurements for engineers and designers.

Discover why your battery keeps draining when not in use, common causes, and effective solutions. Learn how to diagnose, fix, ...

A team partially replaced lithium in a lithium antimonide compound with the metal scandium. This creates specific gaps, so-called vacancies, in the crystal lattice of the conductor material. These ...

AKM and SAL have developed a joint proof of concept for integrating a current sensor into a power module for automotive ...

Explore Ohm's Law and its key relationship between voltage, current, and resistance in conductors and quantum mechanics.

Innovations in semiconductor technology—such as advancements in AI high-performance computing (HPC), Angstrom-scale silicon ...

John Williamson, the electrical operations supervisor for the Minnesota Department of Labor and Industry, compares voltage in ...